Re: [amsat-bb] Info on the G5500 elevation drive including bearing diameter

[Cliff Buttschardt <cbuttsch@xxxxxxxxxx>]

Very glad to get this advice.  What is the part number for the pots?
Are they identical?  I gather there is no reasonable substitute so are
we stuck with YAESU?  Are you re-assembling with outboard motor grease
or something similar?  I DON'T want to take this apart more than once!
Cliff K7RR

Gary \"Joe\" Mayfield wrote:
> 
> All good advice from Bill!  The AZ screws will be just as bad.  I broke down
> and went to the auto parts store and bought an impact driver ($20).  It is a
> deal you hit with a hammer and it turns as you drive it.  It was scary to
> use, but it worked.
> 
> Merry Christmas and 73,
> Joe
> ka0yos@amsat.org
> 
> ----- Original Message -----
> From: "William P Gravett" <wgravett@juno.com>
> To: <amsat-bb@AMSAT.Org>
> Sent: Wednesday, December 18, 2002 10:28 PM
> Subject: [amsat-bb] Info on the G5500 elevation drive including bearing
> diameter
> 
> > I pulled the elevation motor apart today after about 1 1/2 years of
> > service and am in a mess! The elevation pot is broken. It is a wire wound
> > 500 ohm variable and only Yaesu seems to have them. The bearing races
> > were full except one bearing had fallen out and was rattling around  in
> > the case. I miked it at 0.312 inches and put it back in the race. After 2
> > years there was a little rust here and there inside but all in all,
> > looked pretty good.........UNTIL I tried to remove the four screws
> > securing the plate  on which the drive motor/gear assembly is mounted to
> > the rotor case. You have to take these four screws loose and remove the
> > motor/gear assembly mounting plate to get to the pot and it's wiring. The
> > screws are knurled on the outside and are a hex head  type. One popped
> > out ok using a hex wrench----the other 3 won't budge. I tried heating
> > with a Mapp gas torch----no joy. I have applied liquid wrench
> > penetrant---will have to see in the morning if that works.
> > Guess if I were going to make  recommendations to a new 5500 owner, so
> > far I would suggest the following.
> >
> > 1.) The feedback pots are pretty delicate. Try not to drop or bang around
> > the rotor.
> >
> > 2.)If you plan to do your own servicing for elevation rotor problems
> > later down the line, save yourself potential  headaches by opening up the
> > elevation rotor prior to putting it in service the first time. Remove the
> > aforementioned hex screws , liberally apply anti-seize compound and
> > reseat them.
> > I don't know about the design on the az rotor but it probably wouldn't
> > hurt to take a peek and look for a similar setup.
> >
> > 3.) I might also add that the weatherproofing on my unit was in bad
> > shape. Get some clear or white silicone caulk and re-caulk the joints/
> > seams once you are ready to reassemble.
> >
> > Merry Christmas and happy New Year
> >
> >
> > Bill, W5PGZ
> >
> > PS: Any suggestions on getting these other 3 bolts loose would be very
> > welcome.
> ----
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